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The 24-105mm F/4 DG OS HSM Lens from Sigma
is a wide-angle to medium telephoto zoom lens with a constant f/4
aperture. It is designed for both full frame and crop sensor Canon DSLR
cameras.

The lens integrates three aspherical elements into its
construction as well as two SLD and two FLD glass elements to help
minimize aberration, field curvature, and distortions throughout the
zoom range as well as provide greater image sharpness while avoiding
reduced peripheral brightness. Super Multi-Layer Coating has also been
applied to lens elements to reduce surface reflections, lens flare, and
ghosting to produce images with higher contrast and color fidelity.

The barrel of the lens is constructed from a Thermally Stable Composite
(TSC) material that offers minimal thermal shrinkage and exceptional
hardness. For autofocus, a Hyper Sonic Motor (HSM) delivers high speed
focus with minimal noise, making it well suited for continuous shooting
and video recording.